<?php

use PHPMailerPHPMailerPHPMailer;
use PHPMailerPHPMailerException;

//Load composer's autoloader
require 'vendor/autoload.php';

$mail = new PHPMailer(true);                              // Passing `true` enables exceptions
try {
    //Server settings
    $mail->SMTPDebug = 2;                                 // Enable verbose debug output
    $mail->isSMTP();                                      // Set mailer to use SMTP
    $mail->Host = 'smtp.gmail.com';  // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;                               // Enable SMTP authentication
    $mail->Username = 'meuemail@gmail.com';                 // SMTP username
    $mail->Password = 'minhasenha123';                           // SMTP password
    $mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
    $mail->Port = 587;                                    // TCP port to connect to

    //Recipients
    $mail->setFrom('meuemail@gmail.com', 'Mailer');
    $mail->addAddress('meuemail@gmail.com', 'Joe User');     // Add a recipient

    //Content
    $mail->isHTML(true);                                  // Set email format to HTML
    $mail->Subject = 'Here is the subject';
    $mail->Body    = 'This is the HTML message body <b>in bold!</b>';
    $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

    $mail->send();
    echo 'Message has been sent';
} catch (Exception $e) {
    echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}
?>

2018-02-18 16:22:22 SERVER -> CLIENT: 220 smtp.gmail.com ESMTP k2sm16846924qtk.60 - gsmtp<br> 2018-02-18 16:22:22 CLIENT -> SERVER: EHLO localhost<br> 2018-02-18 16:22:23 SERVER -> CLIENT: 250-smtp.gmail.com at your service, [2804:431:b705:30c:3c68:a6f0:fd8e:b468]250-SIZE 35882577250-8BITMIME250-STARTTLS250-ENHANCEDSTATUSCODES250-PIPELINING250-CHUNKING250 SMTPUTF8<br> 2018-02-18 16:22:23 CLIENT -> SERVER: STARTTLS<br> 2018-02-18 16:22:23 SERVER -> CLIENT: 220 2.0.0 Ready to start TLS<br> SMTP Error: Could not connect to SMTP host.<br> 2018-02-18 16:22:23 CLIENT -> SERVER: QUIT<br> 2018-02-18 16:22:23 <br> 2018-02-18 16:22:23 <br> SMTP Error: Could not connect to SMTP host.<br> Message could not be sent. Mailer Error: SMTP Error: Could not connect to SMTP host.